Cannula



FIG. 1 is a perspective view of a cannula in accordance with the present invention;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevation view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a rear elevation view thereof; and,

FIG. 6 is a front elevation view thereof.

The broken lines in FIGS. 1, 2, 5, and 6 are for illustrative purposes only and form no part of the claimed invention. 

CLAIM The ornamental design for a cannula, as shown and described. 